java/awt/Window/FindOwner: Focus is not gained upon mouse click

ADDITIONAL SYSTEM INFORMATION :
Microsoft Windows [Version 10.0.17134.165]

JDK under test: C:\\Program Files\\Java\\jdk-10.0.2
java version "10.0.2" 2018-07-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode)

A DESCRIPTION OF THE PROBLEM :
The test java/awt/Window/FindOwner/FindOwnerTest.java fails on Windows with the message "Focus is not gained upon mouse click"
The issue was also observed on MacOSX.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
>java -jar jtreg\lib\jtreg.jar -ignore:quiet -v -a -xml -testjdk:"C:\Program Files\Java\jdk-10.0.2" -javaoptions:"-Djava.awt.headless=false" test\java\awt\Window\FindOwner\FindOwnerTest.html

ACTUAL -
#section:applet
----------messages:(4/192)----------
command: applet FindOwnerTest.html
reason: User specified action: run applet FindOwnerTest.html
Additional options from @modules: --add-modules java.desktop
elapsed time (seconds): 1.545
----------System.out:(1/29)----------
java.awt.Point[x=100,y=100]
----------System.err:(8/545)----------
java.lang.RuntimeException: java.lang.Exception: Focus is not gained upon mouse click
at FindOwnerTest.start(FindOwnerTest.java:104)
at com.sun.javatest.regtest.agent.AppletWrapper$AppletRunnable.run(AppletWrapper.java:158)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.lang.Exception: Focus is not gained upon mouse click
at FindOwnerTest.start(FindOwnerTest.java:84)
... 2 more
STATUS:Failed.Applet thread threw exception: java.lang.RuntimeException: java.lang.Exception: Focus is not gained upon mouse click

---------- BEGIN SOURCE ----------
http://hg.openjdk.java.net/jdk10/jdk10/jdk/file/777356696811/test/java/awt/Window/FindOwner/FindOwnerTest.java
---------- END SOURCE ----------

FREQUENCY : always